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CA2162538A1 - Systeme de suppression d'echos pour conferences vocales - Google Patents

Systeme de suppression d'echos pour conferences vocales

Info

Publication number
CA2162538A1
CA2162538A1 CA002162538A CA2162538A CA2162538A1 CA 2162538 A1 CA2162538 A1 CA 2162538A1 CA 002162538 A CA002162538 A CA 002162538A CA 2162538 A CA2162538 A CA 2162538A CA 2162538 A1 CA2162538 A1 CA 2162538A1
Authority
CA
Canada
Prior art keywords
echo
channel
input signal
cancelling system
system suitable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002162538A
Other languages
English (en)
Other versions
CA2162538C (fr
Inventor
Atsushi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of CA2162538A1 publication Critical patent/CA2162538A1/fr
Application granted granted Critical
Publication of CA2162538C publication Critical patent/CA2162538C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephone Function (AREA)
  • Filters That Use Time-Delay Elements (AREA)
CA002162538A 1994-11-09 1995-11-09 Systeme de suppression d'echos pour conferences vocales Expired - Fee Related CA2162538C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6274128A JP2765494B2 (ja) 1994-11-09 1994-11-09 ２線式音声会議装置
JP274128/1994 1994-11-09

Publications (2)

Publication Number Publication Date
CA2162538A1 true CA2162538A1 (fr) 1996-05-10
CA2162538C CA2162538C (fr) 2001-08-07

Family

ID=17537414

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002162538A Expired - Fee Related CA2162538C (fr) 1994-11-09 1995-11-09 Systeme de suppression d'echos pour conferences vocales

Country Status (4)

Country Link
US (1) US5737408A (fr)
EP (1) EP0725527A1 (fr)
JP (1) JP2765494B2 (fr)
CA (1) CA2162538C (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2918025B2 (ja) * 1996-04-24 1999-07-12 日本電気株式会社 ２線式音声会議装置
GB2330745B (en) * 1997-10-24 2002-08-21 Mitel Corp Nonlinear processor for acoustic echo canceller
US6799062B1 (en) * 2000-10-19 2004-09-28 Motorola Inc. Full-duplex hands-free transparency circuit and method therefor
US20040001597A1 (en) * 2002-07-01 2004-01-01 Tandberg Asa Audio communication system and method with improved acoustic characteristics
US7599432B2 (en) * 2003-12-08 2009-10-06 Freescale Semiconductor, Inc. Method and apparatus for dynamically inserting gain in an adaptive filter system
US7835774B1 (en) 2006-09-12 2010-11-16 Avaya Inc. Removal of local duplication voice on conference calls
US7860236B2 (en) * 2007-02-01 2010-12-28 Hewlet-Packard Company Method and system for echo cancellation in a network switch
US20090012786A1 (en) * 2007-07-06 2009-01-08 Texas Instruments Incorporated Adaptive Noise Cancellation
US8411871B2 (en) * 2007-08-22 2013-04-02 Lantiq Deutschland Gmbh Echo cancellation
JP5161838B2 (ja) * 2009-05-18 2013-03-13 株式会社日立製作所 エコーキャンセラおよび音響エコー消去方法
WO2013142723A1 (fr) 2012-03-23 2013-09-26 Dolby Laboratories Licensing Corporation Détection de voix active hiérarchique
EP3667662B1 (fr) * 2018-12-12 2022-08-10 Panasonic Intellectual Property Corporation of America Dispositif d'annulation d'écho acoustique, procédé d'annulation d'écho acoustique et programme d'annulation d'écho acoustique

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629829A (en) * 1984-12-14 1986-12-16 Motorola, Inc. Full duplex speakerphone for radio and landline telephones
JPH063950B2 (ja) * 1985-02-28 1994-01-12 株式会社東芝 拡声電話装置
US4912758A (en) * 1988-10-26 1990-03-27 International Business Machines Corporation Full-duplex digital speakerphone
JP2785336B2 (ja) * 1989-06-13 1998-08-13 日本電気株式会社 音響エコーキャンセラのトレーニング方式
FR2651077B1 (fr) * 1989-08-18 1994-06-10 Letourneur Gregoire Dispositif de traitement d'echo notamment acoustique dans une ligne telephonique
CA2001277C (fr) * 1989-10-24 1994-07-12 Bruce Leigh Townsend Methode et appareil de telecommunication a mains libres
US5075687A (en) * 1990-09-27 1991-12-24 Advanced Micro Devices, Inc. Echo suppression with both digital and analog variable attenuators
US5313498A (en) * 1991-06-13 1994-05-17 Nec Corporation Method and arrangement of echo elimination in digital telecommunications system
US5365583A (en) * 1992-07-02 1994-11-15 Polycom, Inc. Method for fail-safe operation in a speaker phone system
JPH06104970A (ja) * 1992-09-18 1994-04-15 Fujitsu Ltd 拡声電話機
US5353348A (en) * 1993-05-14 1994-10-04 Jrc International, Inc. Double echo cancelling system

Also Published As

Publication number Publication date
JPH08139647A (ja) 1996-05-31
JP2765494B2 (ja) 1998-06-18
EP0725527A1 (fr) 1996-08-07
CA2162538C (fr) 2001-08-07
US5737408A (en) 1998-04-07

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed